Here are some issues we have fixed

We have fixed the visual glitch (“rectangle slivers”) that appears on Live Tiles on the Start menu with the new tile animation. In general, performance of the Start menu should be better in this build.

We believe we have fixed a lot of the crashes with Microsoft Edge (Project Spartan) reported by Windows Insiders.

Developers – when you go to Settings > Update & Security > For developers – it no longer crashes the Settings app.

We fixed the issue some people were seeing where their graphics driver fails to install from Windows Update with error code 80070103. This was happening because WU was trying to re-issue the driver.

You should now be able to edit the IPv4 properties of an Ethernet adapter on your PC.

We have fixed issues where fonts would render blurry on High DPI displays. We’re cooking up a blog post we plan to publish shortly that talks a little more in depth about our investment with High DPI in Windows 10 so watch for it.

We have fixed some keyboard shortcuts in Microsoft Edge. Control + L or Alt + D shortcuts now got to the URL bar more reliably.

Here are some known issues for this build

See my note above regarding the issue on PCs with AMD GPUs and frequent crashes in Microsoft Edge.

Upgrading to this build on certain PCs may fail and roll back to the previously installed build with error 0x80070057 – 0x20007. This is a bug where too many device INFs are being migrated and hitting an internal limit. Possible workaround is to use Disk Cleanup to clean up system files and choose Device driver packages, Previous Windows installations and Temporary Windows installation files. You may also need to remove unnecessary peripherals and remove them from Device Manager and trying the upgrade again.

In this build there is a bug that may cause issues with Cortana speech. If you are experiencing problems with speech recognition, or are getting errors when trying to speak to Cortana, please visit this thread on the Windows Insider Program forum for assistance in recovering from this bug.